Sen. Rand Paul on Wednesday night announced plans to try to undo parts of President Barack Obama’s executive proposals to curb gun violence, saying the president may be developing a “king-like complex.”

“We will nullify anything the president does that smacks of legislation,” the Kentucky Republican said on Fox News in reference to 23 actions Obama unveiled earlier in the day. The executive actions range from steps to encourage states to improve information sharing on background checks to directing the Centers for Disease Control and Prevention to conduct new studies related to gun violence.

“I’m very concerned about this president,” Paul said, before alluding to contentious executive actions taken by President Franklin D. Roosevelt during his record-setting tenure in the White House. Roosevelt served three full terms and part of a fourth. He died in office.